Muffler



May 24, 1932. F. E. KERSEY 1,859,400

MUFFLER Filed Sept. 25, 1930 FY 1- Z5 awn-for Emmi J5 4/ :12;

Patented May 24, 1932 PATENT oar-Ice rmcrs 1'. mm, or memoir. mama FILER Application am September as. 1930. mm Io. nun.

This invention relates to a mufiler adapted for use with the exhaust of an internal combustion engine. The object of the'invention is to provide a device which will not only v mufilethe sound of the exhaust but which will ofier .very little back pressure to reduce the power of the automobile and which will respond to relieve excessive pressure without injury to the muffler in the case of back-fire,

all as will be more particularly pointed out hereinafter and claimed.

Referring to the accompan 'ng drawings, which are made a part hereo and on which similar reference characters, indicate similar a parts,

Figure 1s a longitudinal 'section illustrat- 1ng one form of the invention,

igure 2, a section on line 2-2 of Figure 1, and

Figure 3, a section on line 3-3 of Figure 1.

In the drawings reference character 10 indicates a casing, here shown as cylindrical but which may be made in any suitable form. The casing is provided with end plates 11 and 12, here shown as fitted within the ends of the casing but which may be secured in any suitable way or made integral with the casing.

'A pair of axially aligned pipes 13 and 14 are positioned centrally of the casing 10. The

pipe 13 forms the inlet for gases and the pipe 14 the outlet from the mufiler. The pipes 13 and 14 are joined together at thelr inner ends to a plate 15, here shown as a square plate having its corners 16'secured within the casing. The plate is provided with a number of perforations 17. The inlet pipe 13 likewise is provided with a number of openings 18 through which exhaust gases from the engine pass into the body of the casing 10. Corresponding openings 19 are provided in the outlet pipe 14 through which exhaust gases pass into the atmosphere. The outlet pipe 14 is also provided with a series of elongated outlet openings 20. These openings are preferably" tapered with the wider end extending toward the direction of flow of the outlet gases. Surrounding the outlet pipe 14 is a c lindrical sleeve 21 to which is attached a dis 22 which fits within the casing 10. The disk 22 of course, if desired, may be made integral with the sleeve 21. Positioned at the rear of the disk .22 and between it and the end plate 12 is a compression spring 23. The sleeve 21 is positioned so as to cover up a portion of the length of the openings 20 in the II pipe 14. From the drawings it will be seen that axial movement of the disk 22 will vary the size of openings through the slots 20 in to the exhaust pipe 14.

In operation the exhaust gases from thev engine enter the pipe 13 and pass out through the openings 18. The plate 15 preventing their passage directly into the pipe 14. These gases impinge against the inner walls of the casin by which their velocity is decreased and y means of'which the noise is muflled. The gases then pass around the outeredge of the plate 15 and through the opening 17 by means of which they are further retarded so as to further mufile any 7 sounds which would be produced by them. The ases then issue through the ports 19 into t e outlet pipe 14 through which they ass to the atmosphere. In entering the easmg 10 at the right of the plate 15 they also impinge against the plate 22 by' means of which their velocity is also retarded. In case of an excessive volume of exhaust gases or in case some combustible gases pass from the engine and explode in the mufiler the high pressure created thereby is relieved by means of the'spring 23 which yields and permits the disk 22 to move axially of the pipe 14 and to uncover more of the o enings 20.

This relieves pressure in the mu or without any damage to it and likewise muflles the sound so as to insure a quiet smooth running of the engine without ,any unnecessary high pressure built up in the mufller to reduce the power of the engine.

It will be obvious to those skilled in the art that various changes may be made in my device without departing from the spirit of the invention and therefore I do not limit myself to what is shown in the drawings and described in the specification, but only as indicated in the appended claims.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is:

1. A mufller comprising a cylindrical casing, a pipe extending through one end of the casing and terminating near the front end of said casing, a disk closing the end of the said pipe, a second pipe secured to the said disk and extending through the other end of the casing, said pipes being provided with openings for permitting the passage of the products of combustion, a flanged sleeve surrounding the said second ipe, spring means tending to hold the said anged sleeve resiliently against the pressure of exhaust gases in the casing, and over said openings in the said second pipe, said openings being controlled by the said sleeve, substantially as set forth.

2. A mufiler comprising a casing, a pair of aligned pipes of a substantially uniform diameter positioned axially of the casing, a disk positioned between the inner ends of said pipes, so as to close passage from one to theother, said disk being connected to the interior of the said casing and provided with a plurality of openings therethrough, said pipes also being provided with a plurality of elongated axially extending openings, said openings providing passage for exhaust ases from an engine, a flanged sleeve sli ably mounted on one of said pipes and adapted to control the size of some of said openings, and a spring against which said flanged sleeve seats, said spring yielding in response to explosions in said casing or to abnormal high pressures in said casing to increase the size of the exhaust openings, substantially as set forth.

3. A mufller comprising a. casing, a pipe extending axiall through said casing, said pipe having a plate separating it into inlet and outlet portions, each portion of said pipe having elongated openings to rovide outlets from and into said pipe, an means resiliently mounted on said outlet ortion of said pipe and yieldable under pred termined high pressure in said casing to increase the size of the outlet openings into said pipe, substantially as set forth.

4. A mufller comprising a casing, a pipe extending axially throughsaid casing, a plate dividing said pipe into inlet and outlet port ons, each portion of said pipe being provided with a plurality of openings, a sleeve mounted on said outlet portion normally coveringa part of said openings therein, said sleeve being further provided with a plate or thirty.

FRANCIS E. KERSEY. 

